Degraded performance: Denial of Service attacks against NERO customer

Stephen Fromm stephenf at
Tue Feb 6 10:40:26 PST 2007

In the last 24 hours, a NERO customer was the target of several large
denial of service (DoS) attacks all in excess of 400Mbps (~40Kpps).
Unfortunately, these attacks also impacted other NERO customers.
Affected customers would have experienced degraded throughput for much
of their internet traffic.  The times of these attacks were:

      * Monday, February 05 2007 12:15-12:20
      * Monday, February 05 2007 12:40-12:50
      * Monday, February 05 2007 21:00-22:30
      * Tuesday, February 06 2007 07:00-07:30
      * Tuesday, February 06 2007 08:00-08:15
      * Tuesday, February 06 2007 08:45-09:00

We are working with the targeted customer and have identified several
sources involved in the attacks and have blocked them at the edge of our
network.  We will continue to monitor for any recurrence.

Please contact the NERO NOC if you have any questions or concerns:

email: noc at
phone: 541.346.6376

Stephen Fromm                         Voice     : 541.346.1712
NERO Operations & Systems Engineer    Fax       : 541.346.4397
UO Computing Center                   Email     : stephenf at
1225 Kincaid St                       GPG KeyID : A852499F
Eugene, OR 97403-1212
GPG Key Fingerprint: 3EFB 33B7 051C 16B4 03BD  85F3 32FE 7E8D A852 499F
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